Question

I am developing a application i am trying to assign image buttons properly but depending on screen they are changing i have added images of low density,high density and midium density images in low high and midium drawable folders.

here is my code and screen shot.

<?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    
android:id="@+id/ScrollView01" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content">    
  <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1" 
    android:gravity="center"
    android:paddingLeft="20dip" 
    android:paddingRight="20dip" >

<TableRow>       
<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
  <ImageButton 
       android:id="@+id/aboutus"
       android:scaleType="fitCenter"
       android:src="@drawable/aboutus"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:padding="2dp"
       android:background="@android:color/transparent"
       />
    <TextView
    android:text="About Us"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="right"
    android:padding="3dip" 
    android:textColor="#ffffff" />
</LinearLayout>
   <LinearLayout 
   android:orientation="vertical" 
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
   <ImageButton
       android:id="@+id/services"         
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:background="@android:color/transparent"
       android:padding="2dp"
       android:src="@drawable/services123" />
    <TextView
    android:text="Services"
     android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="right"
    android:padding="3dip" android:textColor="#ffffff" />
    </LinearLayout>
  </TableRow>    
    <TableRow>
        <LinearLayout android:orientation="vertical" android:layout_width="fill_parent"
       android:layout_height="fill_parent">
    <ImageButton 
       android:id="@+id/courses"           
       android:src="@drawable/services"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:padding="2dp"
       android:background="@android:color/transparent"
       />
    <TextView
    android:text="Courses"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="right"
    android:padding="3dip" android:textColor="#ffffff" />
</LinearLayout>
   <LinearLayout 
   android:orientation="vertical" 
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">     
    <ImageButton 
       android:id="@+id/contactus"
       android:src="@drawable/services"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:padding="2dp"
       android:background="@android:color/transparent"
       />
       <TextView
    android:text="contact us"
     android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="right"
    android:padding="3dip" android:textColor="#ffffff" />
   </LinearLayout>
 </TableRow>
      <TableRow>
         <LinearLayout android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">
    <ImageButton 
       android:id="@+id/syllabus"
       android:src="@drawable/services"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:padding="2dp"
       android:background="@android:color/transparent"
       />
    <TextView
    android:text="Syllabus"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="right"
    android:padding="3dip" 
    android:textColor="#ffffff" />
</LinearLayout>
   <LinearLayout 
   android:orientation="vertical" 
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">          
    <ImageButton 
       android:id="@+id/pingtoupdates"
       android:src="@drawable/services"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:padding="2dp"
       android:background="@android:color/transparent"
       />
    <TextView
    android:text="Ping To Updates"
     android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="right"
    android:padding="3dip" android:textColor="#ffffff" />
    </LinearLayout>
  </TableRow>
 </TableLayout>

Answer 1

There are two much of variations in layout_width and height from one table row item to the other. In some LinearLayout you have used fill_parent,fill_parent and in some wrap_content, wrap_content. First you need to correct this as you’r requirement says that each row items should be of same dimensions.

For you case better approach would be to use a GridView. You just need to create one layout file(XML) for the row item and then you can use this for all the row items.
Here is a sample code for grid item:

 <LinearLayout 
    android:orientation="vertical" 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
        <ImageButton 
           android:id="@+id/aboutus"
           android:src="@drawable/aboutus"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:padding="2dp"
           android:background="@android:color/transparent"/>
        <TextView
           android:text="About Us"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:gravity="right"
           android:padding="3dip" 
           android:textColor="#ffffff" />
</LinearLayout>

If you are new to GridView follow this link

After you are done with this then you should try multiple device support.
You can follow this link for multiple device support.

You can also have a look at this stackoverflow post.